Gear



Patented Mar. 1, 1932 UNITED STATES PATENT OFFICE A MAX BTTNER, OF DRESDEN LAUBEGAST, G'ERB/[NY,I ASSIGNOR TD OTTO MICHLK, OF

FREITAL, NEAR DRESDEN, GERMANY" GEAR, j

Application moa November 11, 192s, serial No. @6.442, 'engineman-y November 2,7, 192s.

The present invention relates to a gear of the type, in which a carrier is connected with the driving member by a crank pln'or cccentric and moves freely thereon.

During the rotation of the eccentric the carrier is pressed against the run of the gear and would move freely about the eccentric. To prevent this rotation a second run is provided which the rolls engage to prevent free rotation. As both curves have a different pitch, a rotation of the driven run is effected, the gearing corresponding tothe difference inthe pitch of both curves. By letting one of the two runs slip the ratio of gearing can be regulated without gradation or a forward and return motion can be effected; not

`only the speed but also the torque of the driven member is varied by reducing the angle of the cam path, i. e., the height of the curve remains the same but its length is eX- tended and the curves become Hatter.

The arrangement can be reversed to transmit power in the opposite direction so that the driven shaft becomes the driving one.

One embodiment of the invention is illustrated in the accompanying drawings, in

which Figure l is a longitudinal section of the gear and Fig. 2, a cross section in the direction A-B.

Referring to the drawings, 7c is the driving shaft with which the driving member a is connected by thewedge Z. In the part a a bolt e is positioned whose central axis is arranged eccentrically to the central axis of 75. Rotatably disposed onthe bolt e are the rims l) with the interposed ball bearings n, so that the rims can rotate freely about the pin e. rIhe rims are interconnected by the pins d, five of which are provided'in the modification shown. On the pins d rest the rolls c which hug the rolls c on the pin e. m is the casing of the gear and contains thc rigid run f consisting of arcs or parts of arcs. Beside the run f another run g is positioned connected with the driven shaft 7L by the pins 0. The runs f and g show a different pitch in their circular paths, the run f in the present case having larger arcs than the run g.

The gear functions as follows:

The rolls'c movably arranged on the eccentric e engage directly the driven member g. Duringthe `rotation of the eccentric @the rimjsrare rpressedagainst the driven member and try to turn it. However, turning cannot take place, as the carrier yields owing to its being positioned on the eccentric. To prevent this yielding, the run fis provided which acts so that the rolls c run oil' on an inclined plane. The run f serves therefore as a guide curve. The roll c is not pressed into the curve f but guided along the latter so that rotary motion without power transmission is prevented, a relative motion taking place only when the run fis permitted to move also, which will be accompanied by a gradual decrease of the angle of inclination of the inclined plane.

In this way an increase in torque corresponding to the decrease of speed of the driven shaft is attained, which is the most important advantage afforded by the invention, as otherwise the gear would provide only for a mere regula-tion of speed. When the rolls c slide along the arcs of the runs f and g, these arcs press each other into such a position that they cover one another. In the present modification gearing is effected when the rnn ,f is stationary and the run g moved forward so that it covers the run f. The ratio of gearing amounts to 6/1, as after one revolution of the shaft c the run g, according to its division into six parts, is shifted one-sixth. As the run g is connected with the driven shaft 7L, the latter makes only one turn to six rotations of the shaft c.

If the casing m with the curve rim f or the curve rim f within the casing m were arranged rotatably instead of vfiXedly, the driven speed of the shaft it would decrease constantly according to the speed of the rim from the point of stoppingV up to the rotary speed of the shaft 7c until the shaft 71, would be perfectly stationary and idle running take place. In this way regulation without gradation of the gearing from maximum speed to idle run can be effected by letting the run f slip.

If the power is to be transmitted in an opposite direction and the shaft 71, becomes the driving shaft, the run g can be braked correspondingly to insure a regulation of gearing without gradation.

I claim In a gear a driving member, a, crank pinv 0n the said driving member, a carrier with rolls moving freely on the said crank pin, two runs arranged side by side and formed of a. plurality of inwardly directed curves, the said curves being of the same height but of different length, the said rollsv of the carrier rolling on the said curves,V thesaid runs being moved relative to another, a

driven member, and a. regulating member,

one of the said runs being connected with the driven part and tlie other one iniuenced by the said regula-tingmember.

In testimony whereof I aiix my signature.

y MAX BTTNER. 

